20190702, 05:11  #199  
"Seth"
Apr 2019
2·103 Posts 
Quote:
https://github.com/sethtroisi/mfaktc/tree/master mod_simple_96_and_check_big_factor96 doesn't calculate the modulo so it uses a slightly different Proofofwork function (instead producing very large modulos instead of small) https://github.com/sethtroisi/mfaktc...helper.cu#L244 The end result is on TFNF results you get a little extra line like this Code:
M59068201 proof_k(17257705361971287559): 30 bits [TF:60:64:mfaktc 0.21 75bit_mul32_gs] M59068201 proof_k(1759939290551364353): 31 bits [TF:60:64:mfaktc 0.21 75bit_mul32_gs] M59068201 proof_k(1297657372566442343): 31 bits [TF:60:64:mfaktc 0.21 75bit_mul32_gs] M59068201 proof_k(8940824503190951977): 29 bits [TF:60:64:mfaktc 0.21 75bit_mul32_gs] [Mon Jul 1 21:59:54 2019] no factor for M59068201 from 2^60 to 2^64 [mfaktc 0.21 75bit_mul32_gs] 

20200109, 01:29  #200 
"Seth"
Apr 2019
2·103 Posts 
What's the appropriate way to report probable false results?
M14951 has a P1 result with B2=9,887,122,214,540,712 which took an estimated 186,161 GHzDays (I guess this isn't impossible, but seems unlikely given the user doesn't appear on any of the top producer lists are regularly submit factors) 
20200109, 02:48  #201  
Jun 2003
4,789 Posts 
Quote:


20200109, 04:24  #202  
"Seth"
Apr 2019
2×103 Posts 
Quote:
https://www.mersenne.org/report_fact...99&tftobits=72 

20200109, 06:38  #203  
Jun 2003
4,789 Posts 
Quote:
Like I said, this is perfectly normal _if_ GMP ECM was used for stage 2. Unless you have some reason to believe that these are specifically fraudulent (apart from the large B2), I suggest that you make peace with it. 

20200428, 16:12  #204 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
3^{2}·23^{2} Posts 
Verifying TF was done
There's a new discussion of verification in https://mersenneforum.org/showthread.php?t=25493

20200808, 00:31  #205 
Sep 2002
Oeiras, Portugal
2^{4}×89 Posts 
I reckon we have another potential case of TF cheating / defective hardware.
User Dirk (#21 in top TF list) has 727,087 GHzD credited for 228 trials and 0 factors found. This amounts to an average of 3,189 GHzD per trial. Today I managed to track some of the recent trials, and the last 4 were in the low 200M range, from 2^71 to 2^85 (!). I don´t know about the previous ones, but I find these results rather suspicious. Would someone with privileged access to the server bother to have a look at it? 
20200808, 01:36  #206  
"James Heinrich"
May 2004
exNorthern Ontario
3·11·97 Posts 
Quote:
Code:
20200129 M194726743 7285 = 40,234 GHd 20200204 M184837931 8185 = 39,742 GHd 20200226 M194726827 7285 = 40,234 GHd 20200328 M196745771 7385 = 39,816 GHd 20200513 M200434841 7385 = 39,084 GHd 20200517 M201360557 7385 = 38,904 GHd 20200630 M202932731 7285 = 38,607 GHd 20200630 M203782673 7285 = 38,446 GHd 20200807 M200687659 7185 = 39,042 GHd 20200807 M204629281 7185 = 38,285 GHd 20200807 M204629309 7185 = 38,285 GHd 20200807 M205132043 7185 = 38,191 GHd If it were my call I would suggest that TF credit be capped at the target TF level for that exponent (7879 for exponents in this range), higher TF results could be accepted but no credit given since (as far as the GIMPS project is concerned) it's a waste of resources. I'll pass this along to George to see if he wants to investigate further, perhaps talk to "Dirk" about it. 

20200808, 02:57  #207  
Serpentine Vermin Jar
Jul 2014
29×113 Posts 
Quote:
M160173253 That's the only "factor found" result, but it is in that high bit range. The user also has a number of PRP (M78949933) and LL tests (M99688541), as well as a few P1 tests, sometimes on the same exponent: M107772919 For whatever reason, this user likes to factor to high TF bit levels and that's okay. 

20200808, 05:52  #208 
P90 years forever!
Aug 2002
Yeehaw, FL
5^{2}·17^{2} Posts 
Lifetime of 6 factors found:
Code:
M160080763 has a factor: 6027040288606836258928409 [TF:82:83:mfaktc 0.21 barrett87_mul32_gs] M160173253 has a factor: 11077083125761109161661041 [TF:83:84:mfaktc 0.21 barrett87_mul32_gs] M158139979 has a factor: 1342523932462359763583 [TF:70:71:mfaktc 0.21 barrett76_mul32_gs] M157400489 has a factor: 3482434867307359525409 [TF:71:72:mfaktc 0.21 barrett76_mul32_gs] M157400641 has a factor: 32396470116696604575641 [TF:74:75:mfaktc 0.21 barrett76_mul32_gs] M160080541 has a factor: 2709190282885551671064721 [TF:81:82:mfaktc 0.21 barrett87_mul32_gs] 
20200808, 14:08  #209 
Sep 2002
Oeiras, Portugal
2^{4}×89 Posts 
Fair enough. Thanks for your prompt replies.

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